maxted Posted June 25, 2016 Share Posted June 25, 2016 Just wondering if anyone has some knowledge on this, Im swapping a mx5 b6ze (115hp) into my mazda b1500 ute that originally had a UA engine (59hp) ( the same chassis although did come out with a VB engine (100hp) and i believe it still had drum brakes front and rear). with the increase in power is there someway the Cert guy measures the braking efficiency? I'm leaning towards retaining the drums so i can keep the standard wheels ect, and i have put all new cylinders and shoes all round (all 8 of the cylinders $$$$) and they seem to work well, So i was thinking wether boosting the drums would help? I have been looking into putting a vh44 pbr inline remote booster as there is no room for a booster on the firewall ( especially once the mx5 intake is there). any help much appreciated Quote Link to comment Share on other sites More sharing options...
yetchh Posted June 25, 2016 Share Posted June 25, 2016 Are there not vented discs from Mazda you can bolt in, or was I just lucky that 121/rx5 discs bolt into a 929.. Quote Link to comment Share on other sites More sharing options...
maxted Posted June 25, 2016 Author Share Posted June 25, 2016 i think the next shape 1977-82 came out with drums all round and solid discs/ drum rear. so i could possibly track down some solid front discs. then the following UN shape has vented discs that can be adapted with different balljoints to fit but i have heard that it messes up the geometry of the front suspension. (i have these brakes and hubs ect) its not going to be a performance vehicle, just going with b6ze to get efi and reliability for daily driving, so if i can retain the drums and just boost them to get through cert I'm more inclined to do that Quote Link to comment Share on other sites More sharing options...
cletus Posted June 26, 2016 Share Posted June 26, 2016 cert brake check for something with more than 50% increase in power over factory, is 5 stops from 100kph- 0kph, under 4.4 seconds, in a total of 3min max. Fade is the main problem with drums in this test- the heat build up causes them to lose efficiency. A booster wont really help with this- as the booster just decreases the force you have to use on the pedal. I have had a few customers who have managed to get things with 4 wheel drums to pass a cert brake test by fitting hi temp linings to the shoes. If i was you id try the brake test yourself, and see what happens, it might be fine as it is 5 Quote Link to comment Share on other sites More sharing options...
Transom Posted June 26, 2016 Share Posted June 26, 2016 Last time I got a cert way back it was 3 hard stops from 100km with a portable deaccellerometer thingy sitting on the floor Same as they used to use for truck cof before the days of brake rollers Ask your friendly local cert guy Boosted at least has to be good What PCD/size are your wheels? 1 Quote Link to comment Share on other sites More sharing options...
Transom Posted June 26, 2016 Share Posted June 26, 2016 ^^^ there we go cert ninja answered while I was thumb typing 4 Quote Link to comment Share on other sites More sharing options...
MaxPower Posted June 26, 2016 Share Posted June 26, 2016 could you sway the test also by removing the tray for cert , thereby lightning the overall weight of the vehicle? 1 Quote Link to comment Share on other sites More sharing options...
maxted Posted June 26, 2016 Author Share Posted June 26, 2016 Thanks Cletus! thats exactly what i needed to know, that was my thoughts as the booster just makes it easier to apply more force. Do you know how they work out the power increase? as this model ute did come out with a 100hp engine so 15 more hp wouldn't break the 50% increase, or is it pretty strict to what the ute had in it regardless i.e. the 59hp UA Steve- Yeah I was going to get in touch with Barry Dowler soon when i have got it mounted in there, its the normal 6 stud pcd and 14" rim, but i definitely want to keep the standard wheels as they have a odd way to clip hubcaps on and I'm definitely going to use those hubcaps Maxpower- now that is some out of the box thinking i like that haha, but i want to be 100% legal tegal as I'm wanting to use it everyday and insurance and actually being safe so my wife can drive it blah blah blah Quote Link to comment Share on other sites More sharing options...
smokin'joe Posted June 26, 2016 Share Posted June 26, 2016 could you sway the test also by removing the tray for cert , thereby lightning the overall weight of the vehicle? and thereby running the risk of a rear end lock up 1 Quote Link to comment Share on other sites More sharing options...
cletus Posted June 26, 2016 Share Posted June 26, 2016 Do you know how they work out the power increase? as this model ute did come out with a 100hp engine so 15 more hp wouldn't break the 50% increase, or is it pretty strict to what the ute had in it regardless i.e. the 59hp UA its based on the engine fitted in that particular vehicle, because there may be diffences in the brake system for the same model with a more powerful engine Quote Link to comment Share on other sites More sharing options...
MaxPower Posted June 26, 2016 Share Posted June 26, 2016 could you sway the test also by removing the tray for cert , thereby lightning the overall weight of the vehicle? and thereby running the risk of a rear end lock up yeah sorry thought about that after.. Quote Link to comment Share on other sites More sharing options...
maxted Posted June 26, 2016 Author Share Posted June 26, 2016 aha yeah that does make sense, if I can prove that this model only had the same brake set-up with all the engine combinations until the next generation would the certification man take that into account? like various workshop manuals i have show only drum on the front right up to 77' and that they came out with the VC 1800. I've just grabbed my old boys nz hobby car manual to have a squizz through and see what it states in there Quote Link to comment Share on other sites More sharing options...
Yowzer Posted June 26, 2016 Share Posted June 26, 2016 could you sway the test also by removing the tray for cert , thereby lightning the overall weight of the vehicle? Also no, as once you refit the tray the cert would be void. Quote Link to comment Share on other sites More sharing options...
M.H. Posted June 26, 2016 Share Posted June 26, 2016 Just adjust the throttle linkage so it only gets half throttle for the test Quote Link to comment Share on other sites More sharing options...
Yowzer Posted June 26, 2016 Share Posted June 26, 2016 Seriously.. I hope you're taking the piss coz anyone with half a brain will know a certifier won't miss that. 2 Quote Link to comment Share on other sites More sharing options...
Rookie Posted June 26, 2016 Share Posted June 26, 2016 And not to mention only having half throttle won't make it brake any better... 3 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted June 26, 2016 Share Posted June 26, 2016 Why would you even want to cheat a brake test? Clearly you've never experienced severe brake fade. I can tell you that heading down a hill onto a corner with both feet on the picks and the car ain't slowing, you have very little time to weigh up the pros and cons of "alternative" braking methods.. 6 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted June 26, 2016 Share Posted June 26, 2016 Happened to me once, went and put new pads and fluid in the next day. Not keen on that happening again. /I shouldn't have been trying to keep up with the bugger anyway. Quote Link to comment Share on other sites More sharing options...
tortron Posted June 27, 2016 Share Posted June 27, 2016 if its something old you will have to worry more about getting it to 100kph 3 times in 3 minutes 7 Quote Link to comment Share on other sites More sharing options...
yetchh Posted June 27, 2016 Share Posted June 27, 2016 I reckon just find the upgrade discs with some metal pads and you'll be laughing.. it doesn't exactly weigh much. *edit.. seems to be a few wrecking on the tard.. that's the way I'd be going. 1 Quote Link to comment Share on other sites More sharing options...
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